P0A1F: Motor Generator B - Performance
2 vehicles · 2 makes
Most Reported On
P0A1F is an OBD-II diagnostic trouble code meaning “Motor Generator B - Performance.” In standard usage this hybrid code corresponds to 'Battery Energy Control Module Performance,' meaning the module that manages the high-voltage battery failed an internal performance or self-test check. This control module monitors the hybrid battery pack's charge, temperature, and cooling, and runs internal integrity checks on its own memory and processing. When those checks don't meet specification, the code is set, and it usually points to an internal module fault rather than the battery cells themselves. Expect a hybrid warning light and possibly reduced electric assist or readiness. This code is most commonly reported on 2016-2019 Chevrolet Volt, and 2019-2022 Hyundai Ioniq.
Common Causes
Diagnostic Tools
To diagnose P0A1F, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
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- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
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- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
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- AutoVIN for vehicle identification
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Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
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- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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FAQ
What does P0A1F mean?
P0A1F stands for "Motor Generator B - Performance." In standard usage this hybrid code corresponds to 'Battery Energy Control Module Performance,' meaning the module that manages the high-voltage battery failed an internal performance or self-test check. This control module monitors the hybrid battery pack's charge, temperature, and cooling, and runs internal integrity checks on its own memory and processing. When those checks don't meet specification, the code is set, and it usually points to an internal module fault rather than the battery cells themselves. Expect a hybrid warning light and possibly reduced electric assist or readiness.
What are the most common causes of P0A1F?
The most common causes of P0A1F are: Internal fault within the battery energy control module, Software/calibration corruption in the module, Damaged wiring or connectors at the module, Poor power or ground supply to the module, Low 12V (auxiliary) battery voltage, Moisture/corrosion intrusion at the module, Faulty hybrid battery pack sensor inputs. The specific cause varies by vehicle.
How much does it cost to fix P0A1F?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P0A1F?
Au7o has documented P0A1F across 2 vehicle models from 2 manufacturers: Chevrolet, Hyundai.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.